private repo clone issue

Hello,I have created one private git repo in bitbucket but i am not able to clone this repo via sourceTree. It will give me error that "This is not a valid souce path / URL". In my friend same repo will clone working fine but in my case this is not working. when i am clone this repo via repo it will work but i want to do via sourceTree. and one more things that i have already clone other repo from GITHUB and now i want to clone this repo. I have also checked option for GIT and it up to date and enable. repo URL : https://<username>@bitbucket.org/<username>/<repo>.gitThanks,